This traditional heavy duty mild steel framing system, 32mm wide with 5mm thick flanges, was originally developed for commerical and industrial applications. W20 is angle beaded and is primarily used for single glazed applications today. W20 is available for internal and external use and can be supplied in the following formats, fixed glazed, awning and casement hung sashes, single doors, double doors, pivot and hinged. sliding and bi-folding.
